Pressed-steel stair.



G. W. BROOKS.

PRESSED STE-EL STAIR.

APPLICATION FILED IAN.12, I915- Patented Jan. 4, 1916-.

I fimromiw;

GH mug GEORGE W. BROOKS, OF TOPEKA, KANSAS.

PRESSED-STEEL STAIR.

Application filed January 12, 1915. Serial No. 1,742.

To'aZZ whom it may concern:

Be it known that I, GEORGE W. Baooxs, a. citizen of the United States,residing at Topeka, in the county of Shawnee and State of Kansas, haveinvented certain new and useful Improvements in -Pressed- Steel Stairs,of which the following is a specification.

This invention relates to certain new and useful improvements inmetallic stairs and it has for its objects among others to provide asimple, improved solid pressed steel tread and riser with means ofinterlocking.

the one riser with the tread of the next stair so as to form a completestair" It has for a further object toprovide a simple form of looking orfastening means which will be concealed from the front of the stair andto provide for adjustment at the front of the tread to allow for variousheights or irregularities in the formation of the treads, or to allow ofan adjustment to correct the errors in the different heights of thefloor landing.

It has for a further object to provide a structure of this characterembodying economy of manufacture, great tensile strength, saving of timein assembling, and which will be neater and more pleasing in appearancethan the prior forms especially those of cast iron.

By forming thestair by dies I am enabled to employ lightermaterialflmore accurate fit without liability of cracking or breaking.Furthermore, the steel isthus reinforced and is stronger than cast iron.Furthermore, no ragged edges are left, hence all abutting joints aretightly fitted, making the construction strong and rigid. Beingaccurately pressed into shape, it is sanitary both as regards rounded orconvex cornersand the nosing. The form. of nosing c nforms to the shape.of standard style of wood treads and has the additional sanitaryfeature of the ends and portion around the safety grips being leftsmooth so that dirt which accumulates on the tread can be brushed olfover the smooth place, thereby making it easy to keep clean. By havingthe rounded poncave corner at theback of the tread which prevents theaccumulation of dirt, I provide a sanitary feature formed from the treaditself, no crevices or corners being provided for the dirt to lodge in.

Other objects and advantages of the invention Will hereinafter appearand the pointed out in the appended claims. The invention. is clearlyillustrated'in the accompanying drawings, which, with the numerals ofreference marked thereon, form a part of this specification, and inwhich- Figure is a perspective view showing I one of my lmpi ovedpressed steel risers and treads, the latter being shown as interlockedwith the adjacent edge of the next riser. Fig. 2 is a vertical sectionaldetail through the front end of the tread. Fig. 3 is a detail invertical section showing a modified construction. for the interlockingof the tread and riser. Fig. 4 is a similarview of a modified form ofconstruction. Fig. 5 is a section similarto Fig. 2 showing a squarenoslng.

Like numerals-of reference indicate like parts throughout the severalviews.

Referring to thedrawings, '1 designates my improved pressed steel treadand riser, the same embodying in one integral element the tread portion2 and the riser 3, the same being formed at a curve, asshown'at 4, atthe point of junction of the riser and tread, the upper end of the riserbeing formedwith a substantially horizontal extension 5 terminating inthe downwardlytandrear- Wardly extended lip or extension 6, asshownclearly in Fig. 1. The forward end of the tread portion 2 is formedinto a half round nosing 7 from the inner face of which depends thesubstantially vertical wall 8 which is extended rearwardly substantiallyhorizontally, as at 9, and terminates in the upwardly extended lip 10.This upwardly extended lip may be substantially vertical and parallel tothe outer wall 8, as seen in Figs. 1 and 2, or it may extend forwardlyfrom its junction with the rear face of the portion 9 at an angle ofabout 1 as seen at 11 in Figs. 3 and 4. Furthermore, the lip 6 of theupper end of the riser may extend vertically, as seen at 12Specification of Letters Patent. Patented Jan, 43:, 1916.

novel features thereof will be particularly stronger than castiron,.with much greater tensile strength and without possibility ofcracking or breaking.

The method of assembling the parts will be readily understood. As seenin Figs. 1, 3 and t, the depending lip of the upper end of the riser isreceived .within the channel of the inwardly extended terminal of thenosing, the riser being placed into position and thus retained by theinterlocking of the interengaged portions of the riser and the adj oimngtread. The riser is readily adj ustable to suit the required height incase error is made in fastening the angles or locating punched holes forholding bolts for supporting the treads. It is to be noted that thebottom of the riser and the top of the tread are concave at the startingpoint of .the tread and also of the riser and that the half round nosingat the front of the tread with a right angle bend supporting the same,with the supporting member returning to the riser and this supportingmember being bent at right angles, thus forming a pro-' jecting nosingor sunken panel riser. The lock is invisible from the. front of thetread, providing a neat finished appearance.

It will be noted that in all the-forms shown,the terminal of either theriser or the tread extends in an inclined direction and has a bearingagainst one of the adjacent members of the other part. In the form shownin Fig. 3 the inclined portion '13 bears 'directly upon the inclinedterminal v11 of the tread. The inclined lip forms a brace and addsstrength to the joints. Fur thermore, by inclosing the depending wallof,

i the extension of the riser, or the terminal wall of the trough-shapedportion of the tread, I form an interlock that aids materially inholdingthe adjacent treads and risers against tendency to get out of properassembled position.

In some cases I have found it desirable to form the tread with footgrips, as shown.

at 14, which may or may not extend for a andextending as they do abovethe face of the tread proper, give an additional wearing surface of thesame depth before the aaeegeae 4 7 foot grips or tread will be wornlevel to the body of the tread proper.

It is evident that l'may employ a rectangular-or square nosing inlieu ofthe rounded nosing previously described. Such is shown in Fig. 5 inwhich 2' is the tread portion, 7 the square nosing, 8 the vertical outerwall, 9' the horizontal extension and 10' the upwardly extended lip. 14:represents the foot grips.

Modifications detail may be resorted to without departing from thespirit of theinvention or sacrificing any of its advantages.

What is'claimed as new is i 1. A pressed steel tread and riser completein a single integral element, the tread being formed with a curved noseand a rearward trough-shaped extension beneath said nose and the riserterminating in a forward extension with rearwardly angularly extendedlip. Y

2. A pressed steel tread and riser complete in a single integralelement, the tread being formed with a curved nose and a riserterminating in an angularly extended lip, and the tread having atrough-shaped portion extended rearwardly from the nose at a distancefrom the surface of the tread for cooperation with the lip oflsanadjoining riser.

3. A pressed steel tread and riser in a single integral element, theriser having at its upper end a horizontal extension and an inclinedterminal forming'a lip and the .tread having a rounded nose terminatingin a trough shaped portion with one wall of which the inclined lip of anadjacent riser .is designed to cooperate.

4'. A pressed steel tread and riser in a single integral element, theriser having at its upper end a horizontal extension and a downwardlyextended terminal, and the tread having a rounded-nose terminating in atrough-shaped portion in which the depending portion of an adjacentriser is received and with which it is designed to cooperate, one of thecooperating portions being inclined.

In testimony whereof l aiiix my signature in presence of two witnesses.

GEORGE W. BRUOKS.

Witnesses: 4

J Moore, G. L. Brena.

